A woman wipes tears as she arrives at a memorial service for fallen Massachusetts Institute of Technology campus officer Sean Collier at MIT in Cambridge, Mass. Wednesday, April 24, 2013. Authorities think the 27-year-old Collier was shot and killed by the Boston Marathon bombing suspects last Thursday. (AP Photo/Elise Amendola)

Associated Press
A woman wipes tears as she arrives at a memorial service for fallen Massachusetts Institute of Technology campus officer Sean Collier at MIT in Cambridge, Mass. Wednesday, April 24, 2013.  Authorities think the 27-year-old Collier was shot and killed by the Boston Marathon bombing suspects last Thursday.  (AP Photo/Elise Amendola)
A woman wipes tears as she arrives at a memorial service for fallen Massachusetts Institute of Technology campus officer Sean Collier at MIT in Cambridge, Mass. Wednesday, April 24, 2013. Authorities think the 27-year-old Collier was shot and killed by the Boston Marathon bombing suspects last Thursday. (AP Photo/Elise Amendola)
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